ANALYSING LOSSES IN HYDROSTATIC DRIVES

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The paper introduces three levels of details in the analysis of losses in hydrostatic drives which are carried out at IFAS of RWTH Aachen University (Germany). The first level of detail investigates the over-all system efficiency, the second level is focused on components while in the third level of detail the tribological contact in hydrostatic displacement machines are analyzed. Due to an increased environmental awareness and rising energy cost energy efficiency becomes a crucial factor in system design, components and single tribological contacts. Therefore the efficient conversion of mechanical into hydraulic energy and vice versa is the main objective when developing e.g. mobile construction machinery. An increase in the energy efficiency of hydraulic pumps, motors, valves and cylinders directly leads to significant reduction in energy consumption of hydrostatic drive lines and working kinematics. From the system point of view the power consumption of the diesel engine, as the power source of most mobile machinery, has to be reduced in order to increase tank-to-wheel efficiency. Modern management strategies for mobile machinery have to include diesel engine, drive line and working hydraulic with focus on an efficient operation of the engine.

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